package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import com.sky.service.UserService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.Collections;
import java.util.List;
import java.util.Set;

@Service
@Slf4j
public class ShoppingCartServiceImpl implements ShoppingCartService {

    @Autowired
    private ShoppingCartMapper shoppingCartMapper;
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private SetmealMapper setmealMapper;

    public void addShoppingCart(ShoppingCartDTO shoppingCartDTO){
        //DTO属性
//        private Long dishId;
//        private Long setmealId;
//        private String dishFlavor;
        //到底是菜品还是套餐 这个直接用动态sql去实现，因为动态sql里面会判断到底是不是为null如果不是null的话就进行查询
        //需要先转化为entity再进行传入
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
        //通过上下文获取现在的用户id 还是Thread的知识
        Long currentId = BaseContext.getCurrentId();
        shoppingCart.setUserId(currentId);

        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);

        //如果已经存在就将number加一 不存在就插入
        if (list!=null && list.size()>0){
            ShoppingCart cart = list.get(0);
            cart.setNumber(cart.getNumber()+1);
            shoppingCartMapper.update(cart);
        }else{
            //到底是菜品还是套餐
            Long setmealId = shoppingCartDTO.getSetmealId();
            Long dishId = shoppingCartDTO.getDishId();
            if(dishId!=null){
                //获取金额图片放入购物车表中
                Dish dish = dishMapper.getById(dishId);
                shoppingCart.setName(dish.getName());
                shoppingCart.setImage(dish.getImage());
                shoppingCart.setAmount(dish.getPrice());
            }else{
                Setmeal setmeal = setmealMapper.getById(setmealId);
                shoppingCart.setName(setmeal.getName());
                shoppingCart.setImage(setmeal.getImage());
                shoppingCart.setAmount(setmeal.getPrice());
            }
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCart.setNumber(1);

            shoppingCartMapper.insert(shoppingCart);
        }


    }

    public List<ShoppingCart> showShoppingCart() {
        //获取到当前微信用户的id
        Long userId = BaseContext.getCurrentId();
        ShoppingCart s = ShoppingCart.builder()
                .userId(userId)
                .build();
        List<ShoppingCart> list = shoppingCartMapper.list(s);
        return list;
    }

    /**
     * 删除购物车中一个商品
     * @param shoppingCartDTO
     */
    public void subShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
        //设置查询条件，查询当前登录用户的购物车数据
        shoppingCart.setUserId(BaseContext.getCurrentId());

        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);

        if(list != null && list.size() > 0){
            shoppingCart = list.get(0);

            Integer number = shoppingCart.getNumber();
            if(number == 1){
                //当前商品在购物车中的份数为1，直接删除当前记录
                shoppingCartMapper.deleteById(shoppingCart.getId());
            }else {
                //当前商品在购物车中的份数不为1，修改份数即可
                shoppingCart.setNumber(shoppingCart.getNumber() - 1);
                shoppingCartMapper.update(shoppingCart);
            }
        }
    }

    public void cleanShoppingCart(){

        Long userId = BaseContext.getCurrentId();


        shoppingCartMapper.deleteByUserId(userId);


    }

}
